These days, search engines like google are placing more focus on incoming links to a website when looking for rank. The reason why being is because they are hard to obtain from trusted sources (a “by the book” website such as the Dmoz directory) and it is a good way to partially remove the group of people who abuse the “on the page” factors of optimisation (page spamming). How is this so? Well, if you have someone who is abusing the “on the page” factors and they have no trusted links to their page (they will likely not get any at all due to spam) then there is absolutely no way of them obtaining a good listing. However, individuals have worked out ways in getting a huge number of links, through link farms and other tactics, whatever the quality of their website. As the search engines are aware of this, it brings us to the topic of how one link can be a lot better than ten.
Obtaining one link from a trusted source can be quite difficult within the sense they do not issue links to simply about anyone. For those who have an excellent website with relevant information, then you will definitely get them. It really is for that reason one link from the trusted source can better a multiple of links off their websites. As this is “trusted” by search engines like google, it will also trust the websites it links to. For those who have ten links from your close friends, it can help you in some sense, but no where near around the one link from the source like Dmoz, unless one of your friends has a very reputable website amongst search engines like google.
Having too many irrelevant links could harm your website’s visibility in the search engines. What is meant with this is having links from websites which have no relation to yours. A good example of this would be a website about cars linking to another site about medicine (unless the sites are reputable and have a valid reason for that link i.e. you will find a relationship made between cars and medicine). Search engines like google will get on this sort of link and definately will provide no weight in improving your visibility. Obtain most of these irrelevant links, then djglva could be viewed as spam (just like a link farm tactic) and that will lower the buzz of your own website within search engines.
The real key here is to concentrate on quality and never quantity. Gaining a couple of good / relevant links is going to take you much further than plenty of irrelevant links. To obtain these quality links, begin by placing your website in directories, but make sure to avoid any “on the page” spamming since this is not going to allow you to get accepted. Once search engines like google have acknowledged a presence of relevant links, follow-up on it and research some methods to acquire more. As time passes, you will see that your website’s performance improves, since the links age, provided you might have performed search engine optimisation. Avoid getting the irrelevant links although it could be tempting to see fast results. It will only be dependent on time before an internet search engine realises the spam tactic, and as we say “fast rise”, fast fall”.